Turbine blade nested seal damper assembly

Abstract

A turbine blade damper seal assembly includes a seal and a damper that both abut a radially outermost non-gas path surface. The seal is fabricated from a plastically deformable material and nests within a recess of the damper. The damper is fabricated from a rigid material that absorbs vibrational energy generated during operation. The recess within the damper provides for both the damper and the seal to be positioned at the radially outermost non-gas path surface.

1. A turbine assembly comprising:
 a plurality of turbine blades spaced apart from each other, wherein each of said plurality of turbine blades includes a platform structure including an inner surface radially inboard of an outer surface; 
 a damper comprising a portion disposed adjacent said inner surface and a recess extending axially between rub surfaces; and 
 a seal nested with said damper and disposed adjacent said inner surface and within the recess between the rub surfaces, wherein the seal is longer than the damper. 
 
   
   
     2. The assembly as recited in  claim 1 , wherein said seal comprises tab portions that fit onto said damper. 
   
   
     3. The assembly as recited in  claim 2 , wherein said damper comprises alignment features for aligning said damper relative to each of said plurality of turbine blades. 
   
   
     4. The assembly as recited in  claim 3 , wherein said alignment features jut outwardly from a body of said damper. 
   
   
     5. The assembly as recited in  claim 1 , wherein each of said plurality of turbine blades comprises a forward portion and a rearward portion and said inner and outer surfaces extend therebetween, said damper disposed adjacent said forward portion. 
   
   
     6. The assembly as recited in  claim 1 , wherein said seal comprises a thin sheet of metal. 
   
   
     7. The assembly as recited in  claim 1 , wherein said damper comprises a molded mass. 
   
   
     8. The assembly as recited in  claim 1 , wherein said damper and said seal are both disposed in a radially most outboard position. 
   
   
     9. The assembly as recited in  claim 1 , wherein adjacent turbine blades define a cavity into which said damper and seal are disposed. 
   
   
     10. The assembly as recited in  claim 9  wherein said damper is disposed in a forward most portion of said cavity. 
   
   
     11. The assembly as recited in  claim 10 , wherein each of said plurality of turbine blades include an alignment feature for positioning said damper within said cavity. 
   
   
     12. A damper seal assembly for a turbine blade comprising:
 a damper comprising two contact surface abutting an inner surfaces of a cavity within a root of the turbine blade, and a recess disposed between the two contact surfaces; and 
 a seal nested with said recess of the damper and abutting the inner surface of the cavity within the root of the turbine blade. 
 
   
   
     13. The assembly as recited in  claim 12 , including a plane defined across said damper by said contact surface wherein a surface of said seal is disposcd within said plane. 
   
   
     14. The assembly as recited in  claim 12 , wherein said damper includes retention features corresponding with the inner surface of the turbine blade. 
   
   
     15. The assembly as recited in  claim 12 , wherein a surface of said seal and said contact surface of said damper abut a radially outermost non-gas path side of the turbine blade. 
   
   
     16. A damper seal assembly comprising:
 a damper comprising a body and at least two rub surfaces extending from the body and separated from each other by a recess; and 
 a seal disposed within the recess comprising a forward portion with fingers projecting therefrom and a rearward portion extending axially a length beyond the damper and including a projection at least in part co-directionally with the fingers. 
 
   
   
     17. The assembly as recited in  claim 16 , wherein said seal includes tab portions that fit onto said damper. 
   
   
     18. The assembly as recited in  claim 17 , wherein said seal is adapted to fit within said recess of said body. 
   
   
     19. The assembly as recited in  claim 18 , wherein said at least two rub surfaces and a surface of said seal form a common plane. 
   
   
     20. A damper comprising:
 a body; 
 at least two rub surfaces extending from the body and separate from each other by a recess; 
 a pair of retention arms extending from a forward portion of the body; and 
 an alignment feature that juts from the body on opposing sides of the body. 
 
   
   
     21. The damper as recited in  claim 20 , including at least one finger extending longitudinally from said body. 
   
   
     22. The damper as recited in  claim 20 , wherein said at least two rub surfaces extend longitudinally along said body. 
   
   
     23. The damper as recited in  claim 20 , including at least one lug extending laterally from said body. 
   
   
     24. The damper as recited in  claim 20 , including at least two lugs disposed on opposite sides of said body. 
   
   
     25. A seal comprising:
 a forward segment including a pair of fingers projecting from each side of the seal, wherein the pair of fingers are spaced a distance from each other and extend downwardly from the seal; and 
 a rearward segment spaced an axial distance from the forward segment that includes a projection at least in part extending co-directionally with each of the pair of fingers. 
 
   
   
     26. The seal as recited in  claim 25 , including a body segment defining a plane, wherein said fingers project at least in part transverse to said plane. 
   
   
     27. The seal as recited in  claim 26  wherein the pair of fingers project transversely from said body segment on a common side.